RunCam 3 - 29 degree camera mount for fpv drones. Also fits the GoPro Session. Just zip tie the base down and run a strap through and over the camera. Adding some 3M two sided tape or thin foam under the camera will help it from vibrating while upside down.
I used FreeCAD so if you want to use meshmixer,blender,or whatever you prefer to modify it feel free to do so. But the dimensions are perfect as it is. Even the zip tie mounts will perfectly fit a zip tie.
The top plate is 4mm and the base at the front zip tie is 4.7 mm. and 3.8 mm on the rear zip tie mount. It's 29 mm wide as most battery mounts are 30 mm. This thing can take a crash without breaking like all these other fancy ones you see